Mercury

Mercury, an interior planet of the Solar system, whose orbit is
nearest the sun, the greatest distance being nearly 43,000,000 m. and the
least over 28,000,000, is one-seventeenth the size of the earth, but is
of greater density, and accomplishes its revolution in about 84 days; it
is visible just before the sun rises and after it sets, but that very
seldom owing to the sun's neighbourhood.